BUGFIX: improve initial loading time by caching xliff file in browser

Classes/Neos/Neos/Ui/Aspects/XliffConfigurationCacheHeaderAspect.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Neos\Neos\Ui\Aspects;
+
+/*                                                                        *
+ * This script belongs to the Neos Flow package "Neos.Neos.Ui".          *
+ *                                                                        *
+ *                                                                        */
+
+use Neos\Flow\Annotations as Flow;
+use Neos\Flow\Aop\JoinPointInterface;
+use Neos\Flow\Session\SessionInterface;
+use Neos\Neos\Controller\Backend\SchemaController;
+
+/**
+ * adds a Cache-Control: max-age=3600 header to the /xliff.json endpoint; speeds up loading the new UI.
+ *
+ * NOTE: we currently do this in an aspect, to also increase performance on older Neos versions (some people still
+ * need time to upgrade to the latest Neos version...)
+ *
+ * @Flow\Scope("singleton")
+ * @Flow\Aspect
+ */
+class XliffConfigurationCacheHeaderAspect
+{
+
+    /**
+     * @Flow\Inject
+     * @var SessionInterface
+     */
+    protected $session;
+
+    /**
+     * @Flow\Before("method(Neos\Neos\Controller\Backend\BackendController->xliffAsJsonAction())")
+     * @param JoinPointInterface $joinPoint
+     * @return mixed
+     */
+    public function setControllerContextFromContentElementWrappingImplementation(JoinPointInterface $joinPoint)
+    {
+        if ($this->session->isStarted() && $this->session->getData('__neosEnabled__')) {
+            /** @var SchemaController $proxy */
+            $proxy = $joinPoint->getProxy();
+
+            // Cache for one week; as cache busting is enabled.
+            $proxy->getControllerContext()->getResponse()->setHeader('Cache-Control', 'max-age=' . (3600 * 24 * 7));
+        }
+    }
+}

Resources/Private/Fusion/Backend/Root.fusion

@@ -35,6 +35,12 @@ backend = Neos.Fusion:Template {
                 absolute = true
                 arguments = Neos.Fusion:RawArray {
                     locale = ${interfaceLanguage}
+
+                    # TODO: dirty hack to not have to re-implement neos:backend.configurationCacheVersion VH
+                    version = Neos.Fusion:Template {
+                        templatePath = 'resource://Neos.Neos.Ui/Private/Templates/Backend/ConfigurationVersion.html'
+                        @process.trim = ${String.trim(value)}
+                    }
                 }
             }
         }